A layer of transparent acrylate polymer dielectric between {TAIL ~ the metal layers} completes {HEAD ~ the interference filter}, which may be sandwiched between protective layers 
A layer of transparent acrylate polymer dielectric between { TAIL ~ the metal layers } completes { HEAD ~ the interference filter } , which may be sandwiched between protective layers
OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH