growing the plurality of carbon nanotubes from {HEAD ~ the at least one exposed portion} of {TAIL ~ the semiconductor substrate} 
growing the plurality of carbon nanotubes from { HEAD ~ the at least one exposed portion } of { TAIL ~ the semiconductor substrate }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL