  Level-crossing (LC) resonances in a buffer-gas-filled cesium vapor cell are
studied under counterpropagating pump and probe light waves with opposite
circular polarizations. The waves excite the D$_1$-line ground-state level
$F_g$$=\,$$4$, while a transverse magnetic field (${\rm B}_x$$\perp$${\rm k}$)
is scanned around zero to observe the resonance of electromagnetically induced
absorption (EIA). It is shown that adding the pump light wave significantly
improves the properties of the resonances in comparison with the commonly used
scheme with a single light wave. As far as a small vapor cell ($\approx\,$0.1
cm$^3$) at relatively low temperature ($\approx\,$45-60$\,^\circ$C) is
utilized, the results have good prospects for developing a low-power
miniaturized atomic magnetometer.
