A mechanism of the Davydov‐like splitting formation in the Brillouin zone of the Hg3TeCl4 crystal (Pbca, D2h15) with two double translationally nonequivalent layers in the unit cell was analyzed. The topology of the 8‐branch elementary energy bands creating the valence band of Hg3TeCl4 was explained. Energetic distances between states of the elementary energy bands at the Brillouin zone edges were estimated by means of the localized function method. The topology of the elementary energy bands was related with the ratio of the interaction strength between the double layers in the unit cell and the interaction strength between single layers creating the double layer. (© 2009 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)