SSS & Different Materials

I found a way to fake SSS by creating a first layer with one kind of BRDF and a second layer using modified  P and N variables when creating the surface shader.  After that i set P and N to their original values before finishing the surface shader the calculations.  Here are some of the results

 Layer 1 - Glass IOR 1.5

Layer 2 - Glass IOR 1.2 - Vornoi Pattern

  Layer 1 - Glass IOR 1.5

Layer 2 - Glass IOR 1.2

  Layer 1 - Plastic

Layer 2 - Plastic - Basic Noise Pattern

  Layer 1 - Glass - IOR 1.5

Layer 2 - Plastic - Basic Noise Pattern

  Layer 1 - Glass - IOR 1.2

Layer 2 - Glass - IOR 1.5- Basic Noise Pattern

  Layer 1 - Glass - IOR 1.3

Layer 2 - Constant Shading - Voronoi Pattern

  Layer 1 - Glass - IOR 1.2

Layer 2 - Glass - IOR 1.5 - Voronoi Pattern

 Layer 1 - Glass - IOR 1.2

Layer 2 - Plastic - Voronoi Pattern