Place one half of the chocolate dough between 2 (17x12-inch) sheets of waxed paper or cooking parchment paper; roll out to 12x7-inch rectangle. Repeat with one half of the peanut butter dough; remove top sheet of waxed paper from both doughs. Invert peanut butter dough onto chocolate dough. Replace waxed paper on dough, and gently roll out to 14x8-inch rectangle. Remove top sheet; trim edges. Starting with long side, roll up dough using bottom sheet of waxed paper to help roll up dough. Wrap dough log tightly with waxed paper; twist ends to enclose. Repeat with remaining cookie doughs. Refrigerate 2 hours 30 minutes or until very firm.