Double-layered polytypic structure of the B form of octadecanoic acid, C18H36O2

Two bimolecular layers forming a double-layered polytypic structure exist in a repeating unit along the stacking direction. The acyl chain inclines toward the ab plane by 27 o and the direction of the inclination is turned by 180 o at every stacking of bimolecular layers. One bimolecular layer has essentially the same structure as that of the ordinary single-layered type of the E form