What is the function of the RHEED gun in a Molecular Beam Epitaxy (MBE) system?

What is the function of the RHEED gun in a Molecular Beam Epitaxy (MBE) system? Correct Answer Monitors the growth of crystal layers

RHEED stands for Reflection high energy electron diffraction. It is used to monitor the growth of crystal layers. It also assesses the crystal quality that forms the epitaxial layer on the substrate.
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