With this keyword the geometry optimization step is selected.
LEVENBERG / RFO / WALK / DESCENT
Rational function optimization.
Potential energy surface walking.
By default deMon2k uses Levenberg-Marquardt steps [215,216] with robust
root finding  in the
structure optimization and the transition state search by the uphill trust
region method [196,197]. Alternatively, RFO  and WALK
 steps are available for restricted step method minimizations
. For the transition state search the (P)-RFO step can be selected
as alternative to the default Levenberg-Marquardt step by specifying the RFO