to electronic-like bands centered at the $M$-points in the Brillouin zone, while the top of the hole-bands are at around $60$ $meV$ below the electronic-like Fermi surface; $(ii)$ the formed charge in the interface orders dipoles in the nearby $TiO_{2}$ layer; $(iii)$ the free charges in $SrTiO_{3}$ screen the dipolar field in the bulk, thus leaving the $TiO_{2}$ dipolar layer near the interface as an important source for the EPI. The oxygen ions in the $TiO_{2}$ dipolar layer vibrate with high-energy $\Omega\approx90$ $meV$, thus making a long-range dipolar electric field acting on metallic electrons in the $FeSe$ monolayer. This gives rise to a long-ranged $EPI$ [@Lee-Interfacial-supplement], [@Johnston1-2], which in the momentum space gives a forward scattering peak - the $EPI-FSP$* pairing mechanism*.

In this paper we make some analytical calculations in the framework of the $EPI-FSP$ theory with a very narrow $\delta$-peak, with the width $q_{c}\ll
k_{F}$, wher $k_{F}$ is the Fermi momentum [@Dan-Dol-Kul-Oud]. Here, we enumerate the obtained results, only: ($\mathbf{1}$) in leading order the *critical temperature* is linearly dependent on the pairing potential $V_{epi}(\mathbf{q})$, i.e. $T_{c0}\approx\left\langle V_{epi}(\mathbf{q})\right\rangle _{q}/4$. In order to obtain $T_{c0}\sim100$ $K$ we set the range of semi-microscopic parameters ($\varepsilon_{\parallel}^{eff}$, $\varepsilon_{\perp}^{eff}$, $q_{eff}$, $h_{0}$, $n_{d}$ - see 