Roll the dough into a rectangle 12 by 24 in/30 by 61 cm.
Brush the dough with the melted butter. Sprinkle the cinnamon sugar over the dough. Rollover the dough lightly with a rolling pin so the sugar adheres to it. Fold the dough crosswise in half to make a 12-in/30-cm square. Roll the dough to seal and slightly stretch it.