When any of you bows, he should spread his arms on his thighs and clap both his palms (Placing them between the knees), as if I am seeing the variation of the fingers of the Messenger of Allah ﷺ. (Using translation from Abū Dāʾūd 868)
إِذَا رَكَعَ أَحَدُكُمْ فَلْيُفْرِشْ ذِرَاعَيْهِ فَخِذَيْهِ وَلْيَجْنَأْ ثُمَّ طَبَّقَ بَيْنَ كَفَّيْهِ فَكَأَنِّي أَنْظُرُ إِلَى اخْتِلَافِ أَصَابِعِ رَسُولِ اللهِ ﷺ قَالَ ثُمَّ طَبَّقَ بَيْنَ كَفَّيْهِ فَأَرَاهُمْ