I don't ski that area often, but I believe that neither PCMR nor Deer Valley allow boundary-crossing. In any event, there's almost no space between the two, so it's not like there's much in the way of backcountry available.
The Canyons, on the other hand, does have at least one backcountry access gate and quite a lot of backcountry skiing accessible from the resort. Keep in mind that four or five people have been killed by avalanches outside The Canyons boundaries in the last few years. In essentially every case, the victims (and the rest of their parties) were not properly equipped for backcountry skiing and had either not listened to or completely ignored the avalanche forecasts.
As far as your query about backcountry guides for the area, I'm not sure if you mean guides as in printed material or guides as in someone you can hire. If you mean printed material, the most comprehensive one for that area is probably:http://www.cs.utah.edu/~hanscom/WasatchTours.html
Volume II is the one you would want.
The following book is outstanding for most of the Wasatch and *especially* for other mountain ranges in Utah, but I don't remember if Tyson covers any of the area in close proximity to PCMR. My copy is at home so I'm just not sure.http://www.trails.com/explore/catalo...579AAC526EB%7D
If you mean guides for hire in the PCMR area, I'm not so sure. I know these people:http://www.exum.ofutah.com/
do guided backcountry skiing/boarding trips in the Wasatch, and they are *most* excellent. I just don't know if their permit area includes the stuff near Park City.
White Pine Touring is the only real backcountry ski shop in Park City and their website lists backcountry tours. You might want to contact them with their questions. I've never had any real interaction with them, but they have a great reputation.http://www.whitepinetouring.com/site/430761/page/105316