To interpret simulation results of crystal growth and interfaces, each atom should be classified as either part of the crystalline or glass phase to define the interface. Several methods have been used to classify atoms as crystalline or glassy. The entropy-based fingerprint (EBF) method classifies atoms based on entropy, calculating the entropy of each atom from its local atomic configuration and determining its degree of order as crystalline or glassy. This approach has been applied to sulfide and silicate glass-ceramics comprising isolated PS 4 3units. Spherical harmonic functions, which characterize the symmetry of specific atomic environments, also serve as indicators for distinguishing between crystalline and glassy atoms. These methods focus on the static coordination environment at a given time. However, it is essential to classify atoms as glassy or crystalline based on PS 4 3dynamical properties.