stretching the carbon nanotube film along {HEAD ~ a second direction} substantially perpendicular with the first direction to obtain a stretched carbon nanotube film, wherein {TAIL ~ step} comprises the substeps of: 
stretching the carbon nanotube film along { HEAD ~ a second direction } substantially perpendicular with the first direction to obtain a stretched carbon nanotube film , wherein { TAIL ~ step } comprises the substeps of :
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 OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH