How does confining separation to a surface define TLC?

Points on how does confining separation to a surface define TLC:

• TLC enables chromatographic separation by confining the process to a thin surface layer on a flat support while a liquid solvent acts across that surface.
• The separation zone is restricted to the adsorbent coating attached to the plate rather than extending into a larger volume.
• This surface confinement ensures that separation occurs entirely along the flat support during solvent movement.

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