In the alternative to assembly 22, {HEAD ~ a specular surface} may be formed by vapor deposition of aluminum directly onto the surface 21 of {TAIL ~ the support} 20 
In the alternative to assembly 22 , { HEAD ~ a specular surface } may be formed by vapor deposition of aluminum directly onto the surface 21 of { TAIL ~ the support } 20
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH