“…The analysis of the surface layers by RHEED showed at T < T a a diffuse halo typical of a strongly disordered (virtually amorphous) surface. At elevated temperatures (T > T a ) RHEED patterns form sets of diffraction rings that are typical of polycrystalline graphites [9]. To analyze our results, namely the influence of modified polycrystalline graphite surface layer structure on the secondary electron yield, we used the theory of kinetic electron emission based on electronic energy loss in binary collisions of projectiles with the target atoms [10].…”