Surface Preparation Laboratory
Penningweg 69-F
1507 DE Zaandam
The Netherlands
 +31-75 612 0501
 +31-75 612 0491
crystals@spl.eu
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At present we offer a single roughness specification for all crystals that we provide. We guarantee an Ra value smaller than 0.03 μm for the full width of the polished surface region. This means that we not only guarantee the flatness on the length scale of atomic terraces, but over the full macroscopic width of the sample to ensure that the orientational accuracy of the surface normal is maintained in a manner that is independent of position.