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