D56 smooth surface as part of the Surface Topography Challenge! 3 scans at different spots by Zygo NewView™ 7300 Optical interferometer at 10 Magnification. Camera Resolution as per software - 1.12um. Scan of 0.3 mm, 0.6mm, 1mm, 2mm, 3mm, and 5mm scan size at two spots using 2um stylus tip by Bruker Dektak XT. AFM Scan 0f 100nm, 250nm, 500nm, 1um,5um,10um,25um,50um using Tap150DLC tip by Bruker Dimension Icon AFM.