How do I set layer depth for GUI Texture GameObjects?

How do I set layer depth for GUI Texture GameObjects? I have two overlapping GameObjects - one is a HUD "container" for a health bar that changes value, but the health bar is always hidden behind the container that shows the max health. Ideas?

Simply set the Z position on the Transform component (negative moves forward, positive moves backwards).

Adjust the Z position value of their game object.