I would highly recommend Eddy Kantar's "RKCB The Final Word
5th Edition" book on the subject. It is by far one of the best books I've ever read, but also one of the most difficult, the same as the subject is.
I think it definitely should but I cannot find a complete description. Here is what I was able to come up with so far:
after the 3♦ relay, opener bids:
3♥ - minimum hand (affected by seat and vulnerability)
3♠ - non-minumin, no 3-card major
3NT - non-minimum, at least ...