Section Linear Response::Polarizabilities
If the system is periodic, by default wavefunctions from a previous kdotp run will be read, to be used in the formulas for the polarizability and hyperpolarizability in the quantum theory of polarization. For testing purposes, you can set this variable to true to disregard the kdotp run, and use the formulas for the finite system. This variable has no effect for a finite system.
sternheimer/em_resp.F90 : 942
call parse_variable(sys%namespace, 'EMForceNoKdotP', .false., em_vars%force_no_kdotp)