  The splitting of magnetic resonance induced by a linearly polarized frequency
comb is presented for Hanle experimental configuration. The experiment is
carried out with thermal Rubidium atoms in an anti-relaxation coated glass
cell. The observed splitting corresponds to steady-state behaviour of the
system over an integrated time scale that is longer than the modulation
frequency. The splitting is only observed for dark resonances, with left and
right circularly polarized light simultaneously coupled to the atomic system.
The missing alternate split components at single photon resonance is consistent
with the theoretical calculation. The different components of the split profile
have distinct response to the direction of the transverse magnetic field. The
response is captured by the theoretical calculation and the underlying physical
mechanism is discussed. These studies will be useful in metrology and
advancement of vector atomic magnetometer.
