:term:`CFOUR_SPIN_SCAL <CFOUR_SPIN_SCAL (CFOUR)>`
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      ON (=1) requests the spin-component scaled variant of the MP2 approach. This keyword has only an effect when :term:`CFOUR_CALC_LEVEL <CFOUR_CALC_LEVEL (CFOUR)>` =MP2 is specified and must be used together with :term:`CFOUR_REFERENCE <CFOUR_REFERENCE (CFOUR)>` =UHF.

      * **Type**: :ref:`boolean <op_c_boolean>`
      * **Default**: false