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