Topological surface states in epitaxial <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:mi>Sn</mml:mi><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mi>n</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mrow><mml:msub><mml:mi>Bi</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>3</mml:…

Topological insulators are good candidates for charge to spin conversion with high efficiency due their spin-polarized topological surface states (TSSs). In this work, we provide experimental evidence two-dimensional (2D) TSSs in ${(\mathrm{Sn}{\mathrm{Bi}}_{2}{\mathrm{Te}}_{4})}_{n} {({\mathrm{Bi}}_{2}{\mathrm{Te}}_{3})}_{m}$ natural van der Waals superlattices grown by molecular beam epitaxy using angle resolved photoelectron spectroscopy and magnetotransport. While the overlap bulk conduction band (BCB) at Fermi energy, it is shown that increasing Sn composition, influence of BCB reduced becomes minimum $\mathrm{Sn}{\mathrm{Bi}}_{2}{\mathrm{Te}}_{4}$. The latter compound, found be form septuplet layers, shows weak antilocalization effect a prefactor $\ensuremath{\alpha}\ensuremath{\sim}--0.41$, indicating behave as one 2D channel which magnetotransport properties influenced large spin-orbit coupling.