This light is reflected from a reflective layer at {TAIL ~ the output surface} and from {HEAD ~ a reflective layer} at the input surface of the member 
This light is reflected from a reflective layer at { TAIL ~ the output surface } and from { HEAD ~ a reflective layer } at the input surface of the member
OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH