Documentation for VR stereo layers

From Unreal Engine 4.11 Released! - Unreal Engine

“Stereo Layers allow you to draw a quad with a texture at any position in the world on a separate layer that’s fed into the VR’s compositor directly. This allows you to make UI that is more readable and less distorted. Currently, this feature is only implemented for the Oculus Rift headset, but will be coming shortly to other platforms!”

Could you please make docs about this feature and how to use it on Android (Gear VR) ?

Thanks