Can you elaborate upon your question please?

• By "levels" do you mean strata within the soil layers or horizons (the physical location in space), or do you in fact mean "concentration" (a chemical characteristic).
• If "foliar-applied zinc" is applied to the leaves (as per the description), there is no interaction with soil zinc.

If on the other hand, you are asking about how plants growing in a soil with a given concentration of root-available zinc absorb and redistribute a second source of zinc applied to the leaves, then that is a somewhat different question.

It will depend greatly on

• the availability of zinc within the rhizosphere,
• the ability of the plant (the individual and the species or cultivar),
• the concentration of zinc within the plant,
• the concentration and chemical nature of the zinc compounds applied to the leaves,
• the presence of chelates and or surfactants,
• environmental conditions

and probably several other factors I can't think of right now.

I suggest you do a bit of library research and look up some articles on plant nutrition and foliar application with the intention of seeing how plants acquire and redistribute elements through different routes.