  We analyze interference processes in atomic ionization induced by a two-color
laser with fundamental frequency $\omega $ and its second harmonic $2\omega $.
The interplay between inter- and intracycle interference processes give rise to
multiphoton peaks which can be named as main or ATI peaks and sidebands, in
analogy to the well-known RABBIT (reconstruction of attosecond harmonic beating
by interference of two-photon transitions). We use the saddle point
approximation (SPA) to extract the complex ionization times of the interfering
electron trajectories. Changing the relative phase between the two colors, the
doubly differential momentum distribution of emitted electrons can be
controlled. We study the dependence of the electron emission as a function of
the relative phase between the $\omega $ and $% 2\omega $ fields within the
strong field approximation (SFA) but beyond the perturbative regime. We focus
on the extraction of the phase delays accounting the electron forward emission
in the direction of the polarized electric fields. We characterize the time
delays in the emission of electrons for visible frequency of the pump and its
first harmonic as a probe [Ti:Sapphire laser ($800$ nm) together with the first
harmonic ($400$ nm)] for a typical $\omega -2\omega $ configuration for argon
ionization. We find excellent agreement between our SPA results and the
corresponding SFA (without any further approximation) and also with previous
perturbative theories.
