Debra: I don't use Rodinal but the following source may have what you are looking for. I keep this URL bookmarked and refer to it often. The charts provide an excellent source of reference information on all types of film/developer combinations.(posted 9251 days ago)For your infomation I use Xtol exclusively and some of my very finest negatives are 120PanF and Xtol.
Good luck.
Bob