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