Still a further embodiment, {HEAD ~ the shaped block} comprises {TAIL ~ a truncated pyramid shaped gallium arsenide structure} 
comprises
Still a further embodiment , { HEAD ~ the shaped block } comprises { TAIL ~ a truncated pyramid shaped gallium arsenide structure }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL