摘要: The recent increase of activity in the field slow‐electron diffraction has resulted a need for agreement on conventions terminology description diperiodic surface structure relative to triperiodic substrate. Vector net terms substrate is suggested. Fractional Miller indices result when mesh larger than mesh. may be either that deposit or selvedge substrate.With relaxation one conditions reciprocal lattice becomes set parallel rods intersecting Ewald sphere continuously with change wavelength incident radiation orientation crystal.The paper discusses applicability seventeen two‐dimensional space groups and eighty three dimensions these structures. A comparison made between different ...