  The nonlocal Darboux transformation of the two - dimensional stationary
Schr\"odinger equation is considered and its relation to the Moutard
transformation is established. It is shown that a special case of the nonlocal
Darboux transformation provides the Moutard transformation. New examples of
solvable two - dimensional stationary Schr\"odinger operators with smooth
potentials are obtained as an application of the nonlocal Darboux
transformation.
