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We propose a hypothesis that the potential energy surface (PES) of interlayerinteraction in diverse 2D materials can be universally described by the firstspatial Fourier harmonics. This statement (checked previously for theinteractions between graphene and hexagonal boron nitride layers in differentcombinations) is verified in the present paper for the case of hydrofluorinatedgraphene (HFG) bilayer with hydrogen bonding between fluorine and hydrogen atthe interlayer interface. The PES for HFG bilayer is obtained through densityfunctional theory calculations with van der Waals corrections. An analyticalexpression based on the first Fourier harmonics describing the PES whichcorresponds to the symmetry of HFG layers is derived. It is found that thecalculated PES can be described by the first Fourier harmonics with theaccuracy of 3\% relative to the PES corrugation. The shear mode frequency,shear modulus and barrier for relative rotation of the layers to incommensuratestates of HFG bilayer are estimated. Additionally it is shown that HFG bilayeris stable relative to the formation of HF molecules as a result of chemicalreactions between the layers.

Universal description of potential energy surface of interlayer interaction in two-dimensional materials by first spatial Fourier harmonics