\begin{table}%ta1
\caption{\label{notations}Definition of axis, angles, and other notations.}
\small%%\centering

\par
\begin{tabular}{rl}
\hline \hline\noalign{\smallskip}
Notation & Definition\\
\hline
$0$ & Subscript applying to the film medium.\\
$1$ & Subscript applying to the medium above the film (air).\\
$2$ & Subscript applying to the medium below the film (substrat).\\
 (s)  & Superscript applying to the direction of polarization of the electric field\\
& perpendicular to the observation plane ($x$, $z$, $\vec{k_{j}}$)\\
 (p)  & Superscript applying to the direction of polarization of the electric field\\
& in the observation plane ($x$, $z$, $\vec{k_{j}}$) and perpendicular to $\vec{k_{j}}$\\
\\
$z$-axis & Direction perpendicular to the surface of the film.\\
$x$-axis & Direction both in the film surface and in the plane in which the \emph{wave vector $\vec{k}$} is.\\
$\hat{x}$-axis & Direction both in the film surface and in the plane in which the \emph{dipole moment $\vec{p}$} is.\\
$\alpha_{j}$ & Observation angle in medium $j$, between $\vec{k_{j}}$ and the $z$-axis.\\
$\theta$ & Angle between $\vec{p}$ and the $z$-axis.\\
$\phi$ & Angle between the $\hat{x}$-axis and the $x$-axis.\\
$\beta$ & Angle between $\vec{p}$ and $\vec{k_{0}}$\\
$\psi$ & Angle between $\vec{E_{0}}$ and $\vec{E_{0}^{\rm (p)}}$\\
\\
$\tilde{n}_{j}$ & Complex refractive index of the medium $j$.\\
$n_{j}$ & Real part of the refractive index of the medium $j$.\\
$\kappa_{j}$ & Imaginary part of the refractive indice of the medium $j$.\\
\\
$\tilde{k}_{j}$ & Complex wave vector in medium $j$.\\
$\vec{E}$ & Electric field created by an electric dipole in an infinite medium.\\
\hline
\end{tabular}
\end{table}