Translation: Ibn Umar (ra) narrates that the Prophet (Peace be upon him) said: When a woman sits in prayer then she should place her one thigh upon the other and attach the stomach to her thighs so that it is more concealing for her. Indeed, Allah looks at her and informs the angels by saying: "O Angels! Be witness that I have forgiven her! [Sunnan al Bayhaqi al-Kubra (3/74)]

This hadith is reliable and also corroborated by many ahadith [I’laal al Sunnan (3/33)]

Translation: Narrated by Yazid bin Abi Habib (ra) that the Prophet (Peace be upon him) passed by two women while they were performing prayer. He said: When you make prostration “KEEP YOUR BODY ATTACHED TO THE GROUND BECAUSE WOMEN ARE NOT LIKE MEN IN THIS CASE” [Sunnan al Bayhaqi al-Kubra (3/74)]

In I’laal al Sunnan (3/26) it is said that narrators of this hadith are relied upon and not rejected
In the Hanafi books of fiqh are listed below.

In all the postures and movements of salah, including qiyam, ruk'u, sajdah, and tashahhud a woman should adopt that which is the most modest and concealing for her.

At the beginning of salah a woman should not raise her hands to her ears but only to her shoulders or close to her bosom.573

In qiyam, women are to place their hands on their bosoms. They can fasten them in any one of the different ways 'akdh' (grasping) or 'wadh' (placing) described in part two, or they can simply rest the right palm on the left one.

Unlike men, in ruk'u, women should tuck their arms into the body and not spread them outward. They should also merely place their hands over their knees with closed fingers, and not grasp them with the fingers spread wide open.574 In fact, women should try to keep their fingers close together in all the postures of salah.

During prostration men should allow for some space and distance between their stomachs and thighs, and arms and the side of the body, whilst women should press these limbs together.

Again in prostration, men should raise their arms off the ground and allow for some distance but women should let them cling to the ground.

During the sitting of tashahhud, men are to rest on their legs and raise their right foot with the toes facing qiblah, whereas women are to take out both their legs towards the right hand side of the body and rest on the posterior without raising their right foot.