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VDW_A2 = [real]
Description: VDW_A2 defines the damping function parameter [math]\displaystyle{ a_{2} }[/math].
VDW_A2 defines the damping function parameter [math]\displaystyle{ a_{2} }[/math] for the DFT-D3 (BJ damping function) and DFT-D4 methods.