  We present a scheme for two-dimensional (2D) atom localization in a
three-level atomic system. The scheme is based on quantum coherence via
classical standing wave fields between the two excited levels. Our results show
that conditional position probability is significantly phase dependent of the
applied field and frequency detuning of spontaneously emitted photons. We
obtain a single localization peak having probability close to unity by
manipulating the control parameters. The effect of atomic level coherence on
the sub-wavelength localization has also been studied. Our scheme may be
helpful in systems involving atom-field interaction.
