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