  We propose a new scheme to control the shape of the Autler-Townes (AT)
doublet in the photoelectron spectrum from atomic resonance-enhanced
multiphoton ionization (REMPI). The scheme is based on the interference of two
AT doublets created by ionization of the strongly driven atom from the ground
and the resonantly excited state using tailored bichromatic femtosecond (fs)
laser pulses. In this scheme, the quantum phase of the photoelectrons is
crucial for the manipulation of the AT doublet. The laser polarization state
and the relative optical phase between the two colors are used to manipulate
the interference pattern. We develop an analytical model to describe the
bichromatic REMPI process and provide a physical picture of the control
mechanism. To validate the model, the results are compared to an ab initio
calculation based on the solution of the 2D time-dependent Schr\"odinger
equation for the non-perturbative interaction of an atom with intense
polarization-shaped bichromatic fs-laser pulses. Our results indicate that the
control mechanism is robust with respect to the laser intensity facilitating
its experimental observation.
