What tasbeeh should be read in between the two Sajdahs?

Assalamu Alaykum Mufti A Hoosen Elias,
I would like to know the Dua to read in between Sajdahs in Salaah and if it is permissible to read Rabbigh Firli Warhamni between the Sajdahs in any Salaah(including Fardh) ?
Also i would like to know if it is permissible when we say the 1st Takbeer , if it is okay to fold our hands while saying ALLAHU Akbar ? or do we have to recite ALLAHU Akbar and then fold our hands after ? which is the correct method ?
Please remember us in your special duas,
JazakALLAH