:term:`GUESS_MIX <GUESS_MIX (SCF)>`
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      Mix the HOMO/LUMO in UHF or UKS to break alpha/beta spatial symmetry. Useful to produce broken-symmetry unrestricted solutions. Notice that this procedure is defined only for calculations in C1 symmetry.

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