We are making simultaneous measurements of the longitudinal and transv
erse resonances in fields of the order of 30 gauss in a parallel plate
geometry, defined by mylar films 100 mum apart, so that l is well ori
ented perpendicular to the static magnetic field. Comparison of our me
asurements with the axial phase frequency relation indicates that the
A-phase is definitely axial at 29.3 bars pressure.