Dear QE Devs/Users, I am a newbie to QE / DFT simulations in solids. For my project, I need to implement the optPBE-vdW functional as it agrees well the experimental structures of ice and ionic hydrates. I noticed that functionals such as optB88-vdW and optB86b-vdW are available through corresponding nametags in funct.f90, but I could not find a similar implementation for optPBE-vdW. Since optPBE-vdW uses a specific PBE/RPBE exchange mixing (~94.5:5.5) with modified (\mu) and (\kappa) parameters for the GGA enhancement factor, I wanted to ask whether optPBE-vdW is already available in QE under another identifier, or if there is a recommended way to implement it within Quantum ESPRESSO. Thank you for your time and assistance. Best regards, Aritra
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