Hi Ann.
A PSA test with 2 decimal places is considered an ultrasensitive test and should be sufficient for monitoring your husband's PSA numbers and rate of rise. That, along with his Decipher results, will guide him and a RO in getting a radiation plan in place and determining the timing of therapy, which will be a balance between healing time vs. disease progress (as tracked by his PSA and, possibly, further imaging) and genetic aggressiveness (as determined by the Decipher results). It would probably be a higher dose to the prostate bed and a small one in a large pelvic zone surrounding it. I recommend the web seminar
Rising PSA After Surgery that a Forum Brother linked in a recent thread. All these issues, as well as ADT, are discussed in the seminar.
Think of any further treatment needed after the RP as the second part of a two-stage primary treatment for his prostate cancer that wasn't prostate-confined, but which can still be knocked out.
(When you update your husband's signature, keep in mind that RP findings, post-op PSA numbers, and any future imaging, testing, and therapy are now the most important facts. His biopsy and pre-op imaging are important history, but are out of the spotlight now that you can benefit from the accurate staging afforded by the whole-prostate exam and post-op report. I would include his pre-op PSA value as well.)
All the best,
Djin