Question regarding screen bezel PCB

The screen bezel is made from PCB material like the backplate. Does it also have a copper layer inside like the original backplate did? I have my antenna stuck to the back of the bezel, as I have replaced the backplate with aluminum. Reception is acceptable, but I feel like it could be a little better especially when the bezel is facing away from the access point. I may just have to live with it, but if I can grind down the back of the bezel to improve reception then I’ll probably do it.