an input reflective layer located on {TAIL ~ the input surface} to substantially totally reflect {HEAD ~ light} toward the output surface 
an input reflective layer located on { TAIL ~ the input surface } to substantially totally reflect { HEAD ~ light } toward the output surface
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH