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