Phill is right about the +-45, and on top it is a dream to work.
The question is, do you really need an overlap? If not there is a nice way to deal with the problem. You just let the two layers overlap, wet them out and then with a very sharp knife you cut trough the two layers. take of the exess on top and carefully lift the toplayer and remove the exess on the underside.
It takes some practise and a very sharp knife