The surface portions are transparent, scatter or reflect incident light or diffract {HEAD ~ the incident light} at {TAIL ~ microscopic relief structures}  
The surface portions are transparent , scatter or reflect incident light or diffract { HEAD ~ the incident light } at { TAIL ~ microscopic relief structures }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH