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For Epitaxial Growth, there is a technique called RHEED (Reflection High Energy Electron Deflection). How do...

For Epitaxial Growth, there is a technique called RHEED (Reflection High Energy Electron Deflection). How do we calculate the layer depth from the RHEED screen? Why is this possible as we are only using a shallow reflection angle; shouldn't it be a steep angle?

Thanks in advance.

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