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Surface roughness of peeled adhesive tape: A mystery?

We study the surface roughness of adhesive tape peeled in stick-slip. We find two regions: a smooth surface region associated with fast crack propagation and a rough surface region associated with slow crack propagation. In both regions the surfaces may be self-affine fractal-like with the fractal dimension Df≈2.3. This fractal dimension is typical for surfaces produced by crack propagation, but unexpected in the present case.