wherein at least a portion of the surface on {HEAD ~ the periphery} of {TAIL ~ the metal wiring} has a region made of a material comprising copper as a main ingredient, 
of
wherein at least a portion of the surface on { HEAD ~ the periphery } of { TAIL ~ the metal wiring } has a region made of a material comprising copper as a main ingredient ,
OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH