{HEAD ~ The plurality} of linear projections may preferably provide an uneven surface which has a center line average surface roughness Ra of {TAIL ~ 15 300 nm} when scanned in a direction parallel to the linear projections, a center line average surface roughness Ra of 20 600 nm when scanned in a direction perpendicular to the linear projections, and an Ra/Ra ratio of at most 0.8 
{ HEAD ~ The plurality } of linear projections may preferably provide an uneven surface which has a center line average surface roughness Ra of { TAIL ~ 15 300 nm } when scanned in a direction parallel to the linear projections , a center line average surface roughness Ra of 20 600 nm when scanned in a direction perpendicular to the linear projections , and an Ra / Ra ratio of at most 0.8
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