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