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