In {TAIL ~ several embodiments} different areas of the film have different thicknesses for producing {HEAD ~ different interference colors} 
In { TAIL ~ several embodiments } different areas of the film have different thicknesses for producing { HEAD ~ different interference colors }
OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD