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