  The electron nondipole dynamics in tunneling ionization in an elliptically
polarized laser field is investigated theoretically using a relativistic
Coulomb-corrected strong-field approximation (SFA) based on the eikonal
approximation of the Klein-Gordon equation. We calculate attoclock
angle-resolved light-front momentum distributions at different ellipticities of
the laser field in quasistatic and nonadiabatic regimes and analyze them with
an improved Simpleman model. The nondipole correlations between longitudinal
and transverse momentum components are examined. Deviations of the
photoelectron momentum distribution calculated via SFA with respect to the
available experimental results as well as with the improved Simpleman model are
discussed and interpreted in terms of nonadiabatic as well as Coulomb effects
in the continuum and under-the-barrier. The favorable prospects of an
experimental observation are discussed.
