Duplicating
            a layer gives you an identical layer that includes the source, material,
            and surface type.
         
         To duplicate a layer:
         
         
            - Select a layer from the Layer Editor
               and do one of the following:
               
                  - At the bottom of the Layer Editor, click
                     the Duplicate Layer button.
                  
 
                  - Right-click a layer and select Duplicate Layer.