  The nematicity in multilayer FeSe/SrTiO$_3$ films has been previously
suggested to be enhanced with decreasing film thickness. Motivated by this,
there have been many discussions about the competing relation between
nematicity and superconductivity. However, the criterion for determining the
nematicity strength in FeSe remains highly debated. The understanding of
nematicity and its relation to superconductivity in FeSe films is therefore
still controversial. Here, we fabricate multilayer FeSe/SrTiO$_3$ films using
molecular beam epitaxy and study the nematic properties by combining
angle-resolved photoemission spectroscopy, nuclear magnetic resonance, and
scanning tunneling microscopy experiments. We unambiguously demonstrate that,
near the interface, the nematicity is suppressed by the SrTiO$_3$-induced
tensile strain; in the bulk region further away from the interface, the
strength of nematicity recovers to the bulk value. Our results not only solve
the controversy about the nematicity in multilayer FeSe films, but also offer
valuable insights into the relationship between nematicity and
superconductivity.
