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