{HEAD ~ A method} 21 wherein the at least partially reflective layer comprises {TAIL ~ a substantially completely reflective metal} 
{ HEAD ~ A method } 21 wherein the at least partially reflective layer comprises { TAIL ~ a substantially completely reflective metal }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL