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Various viscoelastic stamps with different surface relief structures: (a) Micro-pillars (Reproduced with permission from [69]; Copyright 2013, Elsevier), (b) grating-like reliefs (Reproduced with permission from [70]; Copyright 2013, AIP Publishing LLC), and (c) angled micro-flaps (Reproduced with permission from [72]; Copyright 2014, American Chemical Society).
