Adjust or get acces to the light im that is visible in 2 sided foliage

Hello, i whould like to create a shader where the edges of mos emit light that is like the subsurface map but a bit stronger when looking at the moss from behind.

THe problem is i need acces to if the thing is in shadow or if it is lit.

I can c a light rim effect when using the two sided foilage shader. that is where i whould like to add the subsurface x2.

Im unsure how i could acces this and just adding a subsurface i think wil cost more processing time and also i cant get it to emit it in the required amount.

OK i gues that just using subsurf x10 does work