Re: Rafa'adain...
Just to make the practice concise:
Rafa'adain is done in four places;
1) Takbeer-ul-Ihraam (When you first raise your hand to go into a state of prayer),
2) Going into the Ruku,
3) Coming out of the Ruku (Sami-Allahu-Liman...)
4) Standing up after Tashahhud (The sitting in the second Rakah, in which the testimony is given...)