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Reflection high-energy electron diffraction (RHEED) is a powerful tool forcharacterizing crystal surface structures. However, the setup geometry leads todistorted and complicated patterns, which are not straightforward to link tothe real-space structures. A program with a graphical user interface isprovided here to simulate the RHEED patterns. Following the Ewald constructionin the kinematic theory, we find out the exact geometric transformation in thismodel that determines the positions of diffraction spots. The program can dealwith many forms of surface structures, including surface reconstructions ordomains. The simulations exhibit great agreement with the experimental resultsin various cases. This program will benefit the structure analysis in thin filmgrowth and surface science studies.

Realistic simulation of reflection high-energy electron diffraction patterns for two-dimensional lattices using Ewald construction