Wikihuman Shader & aLSurface Shader Maps

[JayBass]

Hi there, I am creating a realistic female bust.
Modeling of the bust has been done in ZBrush and the surface details are complete. I am now at the point of creating all the required maps to conform to the Wikihuman skin shader or the aLSurface shader. I have managed to generate the displacement, defuse and specular maps and find myself stuck in the creation of the single scatter map. Is there a procedure for the creation of single scatter maps that I could follow?

Here is the bust in a gray blin with the displacement...