

The first one that occurs to me is having layers connect to, for instance, two composites set to bitmap.

There might be cases in which that doesn’t happen. The layer closer to the camera should be on top of the others. You can also edit the Z values of any given layer in minimum increments, like 0.001 or -0.001, via the Timeline. If you just want to order your layers, it’s probably not the best option to use the Top or the Side views. If you want a camera move you might want to use the Top View to place layers at different distances from the camera. For most situations, if you don’t need the layers to have different Z values, you can just order them on the Timeline (the top layer will be on top) or on the Node View (the left-most layer will be on top).
