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