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