Dhikr in the sitting posture

There are two sitting postures, the first being the jalsa, the short sitting between the two sajdahs. The prayer addressed in this position is as follows:

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Allāh-umma-ghfir-lī wa rḥam-nī wa-hdi-nī wa ‘āfi-nī wa-rzuq-nī (AD. 2:143). wajbur-nī wa-rfa‘nī (IM. 5:23).
O Allāh! grant me protection and have mercy on me and grant me security and guide me and grant me sustenance and set right my affairs and exalt me!

The second sitting position, the qa‘dah, is assumed after two rak‘ahs have been offered. And then the following prayer, called al-tashshahud, is offered.

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At-taḥyyātu li-llāhi wa-ṣ-ṣalawātu wa-ṭayyi bātu; as-ṣalāmu ‘alai-ka ayyuha-n-nabiyyu wa raḥmatu-llāhi wa bara-kātuhū, as-salāmu ‘alainā wa ‘alā ‘ibādillāhi-s-ṣāliḥ īn. Ashhadu al-lā ilāha ill-Allāhu wa ashhadu anna Muḥammadan ‘abdu-hū wa rasūluh. (Tr. 2:100).