Introduction.- Crystal Lattices and Reciprocal Lattices.- Kinematic Scattering of Waves and Diffraction Conditions.- RHEED Reflection Mode.- X-Ray Diffraction.- RHEED Transmission Mode and RHEED Pole Figure.- Instrumentation for RHEED Pole Figure.- Origins of Texture Formation.- Techniques to Control Thin Film Textures.- Applications and Future Direction.- Appendix A: Operational Procedures for RHEED Pole Figure.- Appendix B: RHEED Pattern Simulations. ...