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Have just been reading a paper which talks about a 'height-height correlation function' of a surface. Doesn't provide any equations, but as far as I can make out it seems to be a way of reducing the topography of the surface to a small number of characteristic parameters, which makes sense in the context of the work (AFM study).

I'd like to know a bit more though. Can anyone provide a simple explanation of the maths behind this, and correlation functions in general? a useful URL that has some details would also help

Thanks

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# Correlation function

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