Elastic tensor and deformation potential for a 2D system

Dear Alex,
I was wondering what approach to follow to calculate or modify the elastic tensor and deformation potential matrix of a 2D system (a monolayer or a bilayer) in order to use them as an input for Amset. Since full relaxation (lattice + atomic) of a 2D system is impractical, we can expect to have absurd numbers for the out of plane components in the elastic tensor and deformation potential matrix. Your suggestions in this regard will be extremely helpful.

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