Yes, you did. I just want to add that a single thicker emulsion will have more internal refelctions, but two layers often act as if they have a huge partially reflective mirror between them. So it is a tossup as to which works better. The fast component is usually coated first, then the medium, with the slow one on top if it is done. Usually, B&W films are done in single layers, and color films are done in mulitilayers.