| 摘要 |
A structure, substrate or other article having a profiled surface comprising a plurality of profiled, in a length direction extending ridges, each ridge having a peak and on opposite sides of the peak a sloping side and an opposite, downwardly directed side, wherein the downwardly directed side comprises an undercutting part which is directed back under the peak of the ridge and wherein the undercutting part extends from a most forward point where the undercutting starts to a valley, wherein 0.1 M<=d<=0.9 M, wherein M is the distance between the most forward point of the peak and the sloping side or an imaginary extension thereof and d is the largest distance in a plane perpendicular to the length direction between the downwardly directed side and a line drawn perpendicular to the sloping side, or extension thereof, and connecting to the most forward point.
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