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