@classmethod
def get_kinetic_energy_cutoff_EEX(cls, calc, **kwargs):
    """Return kinetic energy cutoff for exact exchange (EEX) operator in eV.

        .. note :: by default returns ecutrho, as indicated in
            http://www.quantum-espresso.org/wp-content/uploads/Doc/INPUT_PW.html
        """
    from qe_tools.constants import ry_to_ev
    parameters = calc.inputs.parameters
    try:
        return parameters.get_dict()['SYSTEM']['ecutfock'] * ry_to_ev
    except KeyError:
        pass
    return cls.get_kinetic_energy_cutoff_charge_density(calc)
