  An alternative approach to the image simulation in high resolution
transmission electron microscopy (HRTEM) is introduced after comparative
analysis of the existing image simulation methods. The alternative method is
based on considering the atom center as an electrostatic interferometer akin to
the conventional off-axis electron biprism within few nanometers of focus
variation. Simulation results are compared with the experimental images of 2D
materials of MoS2, BN recorded under the optimum combination of third order
spherical aberration (Cs)= -35 micrometers and defocus = 1, 4, and 8 nm and are
found to be in good agreement.
