The method 20, comprising reducing {HEAD ~ the external reflectance} of the passive top multilayer stack with {TAIL ~ at least one absorption layer group} in said top multilayer stack 
with
The method 20 , comprising reducing { HEAD ~ the external reflectance } of the passive top multilayer stack with { TAIL ~ at least one absorption layer group } in said top multilayer stack
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH