{HEAD ~ The uneven surface} of the electroconductive substrate may preferably have {TAIL ~ a center line average surface roughness} (Ra of 15 300 nm when scanned in a direction parallel to the linear projections and a center line average surface roughness Ra of 20 600 nm when scanned in a direction perpendicular to the linear projections 
preferably have
{ HEAD ~ The uneven surface } of the electroconductive substrate may preferably have { TAIL ~ a center line average surface roughness } ( Ra of 15 300 nm when scanned in a direction parallel to the linear projections and a center line average surface roughness Ra of 20 600 nm when scanned in a direction perpendicular to the linear projections
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH