Additional comments on the theoretical formulation of X-ray moiré fringes

Supplementary explanations are given to a theoretical formulation of X-ray moiré fringes presented in a previous paper. Properties of moiré fringes are clarified on the basis of the exact phase calculation of interfering waves. The importance of additional phase terms from the Pendellösung intensity oscillation and a bicrystal gap for interpreting the moiré pattern is discussed.