This article explains the layering options in the Epson SC-S80600 driver.
Inkset:
First of all, in order to be able to print in multiple layers you need to select a layering inkset:
1. Color = Color only
2. Color + White = Color & White in one layer
3. Color + White 2 Layers = Color & White in two separate layers
4. Color + White 3 Layers 1 way = Color + White in three separate layers, but viewed in 1 direction:
Surface/Reverse
5. Color + White 3 layers 2 way = Color + White in three separate layers, but viewed in 2 directions(Sandwich printing):
Surface/Reverse