If someone gives me a thin film of Si, and they tell me it's (001) Si, does that mean that the (001) planes of Si are the ones making up the surface of the film?
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$\begingroup$ Here is some information on Miller Indices that should help: en.wikipedia.org/wiki/Miller_indices $\endgroup$– wgrenardCommented Apr 3, 2014 at 23:25
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The surface of the film is a [001] plane through the silicon (or diamond) lattice, space group Fd-3m (#227),
![Si [001] plane](https://i.sstatic.net/AvwgW.jpg)
