Gently unroll pie crust and press into bottom and up sides of 9 in. pie pan. Pour peach mixture into crust. Scatter pieces of butter over top. On a lightly floured surface, gently unroll second pie crust. Cut dough into 3/4 in. strips. Place strips horizontally, then vertically, across the top of the pie, trimming so that each strip comes to the edge of the pie. Fold bottom crust over strips and pinch to seal.