As is known from the elementary course of crystallography, to determine the symbol [r₀, r₁, r₂, r₃] of the belt axis of a hexagonal-isotropic complex from the symbols of two non-parallel faces (p₀, p₁, p₂, p₃) and (q₀, q₁, q₂, q₃) belonging to this belt, you can use the following technique (see article).