  Anisotropic diffusion is one of the potential interpretations for the
morphology of the Geminga pulsar halo. It interprets the observed
slow-diffusion phenomenon through a geometric effect, assuming the mean
magnetic field direction around Geminga is closely aligned with the line of
sight toward it. However, this direction should not extend further than the
correlation length of the turbulent magnetic field $L_c$, which could be $100$
pc or less. We first revisit the $L_c=\infty$ scenario and show that the halo
asymmetry predicted by this scenario is mainly contributed by the electrons
located beyond the ``core" section around Geminga, which has a length of $100$
pc. Then, considering the directional variation of the magnetic field beyond
the core section, we take one magnetic field configuration as an example to
investigate the possible halo morphology. The predicted morphology has some
different features compared to the $L_c=\infty$ scenario. The current
experiments may already be able to test these features. In addition, we use a
semi-analytical method to solve the anisotropic propagation equation, which
offers significant convenience compared to numerical approaches.
