  Larmor precession of laser-polarized atoms contained in
anti-relaxation-coated cells, detected via nonlinear magneto-optical rotation
(NMOR) is a promising technique for a new generation of ultra-sensitive atomic
magnetometers. For magnetic fields directed along the light propagation
direction, resonances in NMOR appear when linearly polarized light is
frequency- or amplitude-modulated at twice the Larmor frequency. Because the
frequency of these resonances depends on the magnitude but not the direction of
the field, they are useful for scalar magnetometry. New NMOR resonances at the
Larmor frequency appear when the magnetic field is tilted away from the light
propagation direction in the plane defined by the light propagation and
polarization vectors. These new resonances, studied both experimentally and
with a density matrix calculation in the present work, offer a convenient
method for NMOR-based vector magnetometry.
