  The world-volume theory of multiple M2-branes proposed recently has a free
scalar field. For large vev of this scalar field the world-volume action
reduces to that of multiple D2-branes with Yang-Mills coupling proportional to
the vev. We suggest that the correct interpretation of this scalar field is as
the radial position of the M2-brane center of mass in a cylindrical polar
coordinate system. Regarding the azimuthal angle as compact we can regard this
as a set of coincident D2-branes in type IIA string theory with varying dilaton
and metric. We find that the effective world-volume theory on the D2-branes has
Yang-Mills coupling proportional to the radial coordinate; furthermore the
radial coordinate satisfies free field equations of motion. This agrees with
the corresponding results derived from the M2-brane world-volume theory.
