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(a) chromium/gold (5 nm/100nm) – 100 × 500 μm2 rectangle. (b) chromium/gold (5 nm/100nm) – 150 μm × 1000 μm lines. (c,d) chromium/gold (10 nm/100nm) – 100 × 500 μm2 rectangle. (e) chromium lines (150 μm × 1000 μm) following the removal of the 100 nm gold layer and (f) 3D image of cracking of the PDMS surface following removal of the chromium/gold (10 nm/100 nm) layer – 100 μm × 500 μm lines.
