Why, if the rook moves next to another rook on the bottom file, does it say, ‘Rah6,’ not ‘Rh6,’

Sort:
AmazingEli001
Do any of you chess geniuses know?
ashvasan
Because if two rooks can move to that square, then how would you know which one if you are trying to recreate the game? If the rook is on the A file, then it is Rah6