Copy an Object to a Layer

To move a selected object onto a different layer, look for the tiny square to the far right of the current layer's name in the Layers palette. Drag that square to a different layer and the object will move to that layer. However, if you want to copy the object so that it stays on its current layer and a copy appears on a different layer, hold down the Option key (PC: Alt key) as you drag the small square.