  We propose a two-dimensional interferometry based on electron wave packet
interference with a cycle-shaped orthogonally polarized two-color laser field.
With such method, sub-cycle and inter-cycle interferences can be disentangled
into different direction in the measured photoelectron momentum spectra. With
the cycle-shaped laser field, the Coulomb influence can be minimized and the
overlapping of interference fringes with the complicate low-energy structures
can be avoided as well. The contributions of excitation effect and long-range
Coulomb potential can be traced in the Fourier domain of the photoelectron
distributions. With these advantages, it allows to get precise information on
valence electron dynamics of atoms or molecules with attosecond resolution and
additional spatial information with angstrom resolution.
