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Identify the pairing interaction and the origin of the orientation dependence, for example coupling to soft transverse-optic phonons that symmetry allows only for some orientations.","problem_ref":"1afbf36ada10d223763e9c45ec0a163448627eb80e8c94fa6ad3b37de10cced9","references":"","settled_by":"Systematic $T_{c}$ versus carrier density and orientation, compared with a microscopic calculation of electron coupling to the soft polar mode for each orientation.","status_note":"","title":"Why does $\\mathrm{KTaO_3}$ interface superconductivity depend on crystal 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