Not sure this has anything to do with Z orders or layer order. It sounds more like you want to render a 2D image behind 3D. To do this you will need to need to render twice. Render the 2d background layer, then render the 3D layer. You will need to set the cameracls attributes so the 3D render does not wipe out your 2D layer.
Sprite Candy and Z-Order
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