The X-ray diffraction pattern of bulk AeSe3 glass has been compared with calculated diffracted patterns. For model calculations the Condense Molecular method was used. The calculated k-space and r-space patterns based on the building blocks of crystalline AszSe3 (c-AszSe3) and As4Se4(C-As4Se,+) respectively, were compared. The molecular model of clusters consisting of 6 Se and 4 As atoms arranged in a crystalline-As4Se4-like structure provides satisfactory fits in both k-space and r-space.