\begin{table}%t2
%\centering
\par
\caption{Analytical expressions for $K_{\perp,1}^{\rm 2D}$, 
$K_{\perp,2}^{\rm 2D}$ and $K_{\perp}^{\rm 2D}=K_{\perp,1}^{\rm 2D}+K_{\perp,2}^{\rm 2D}$.
$\xi (s)$ denotes the function $\xi (s) = \left[ {1 \over 4(2-s)} + {1 
\over \pi (s+1)} \right]
{\sqrt{\pi} \over 4} {\Gamma \left( {s+2 \over 2} \right) \over \Gamma 
\left( {s+5 \over 2} \right)}$.\label{table2}}
\begin{tabular}{llll}\hline\hline
\vphantom{$1 \over 2$} Case              & $ K_{\perp,1}^{\rm 2D} 			$ & $ K_{\perp,2}^{\rm 2D}					$ & $ K_{\perp}^{\rm 2D} $ \\\noalign{\smallskip}
\hline 
\noalign{\smallskip}
\vphantom{$1 \over 2$} $ a \ll R \ll 1 $ & $ {2 \over 3s} \left( {a 
\over R} \right)^2 			$ & $	{1 \over 3s} \left( {a \over R} \right)^2	$ & 
$ {1 \over s} \left( {a \over R} \right)^2		$ \\
\vphantom{$1 \over 2$} $ a \ll 1 \ll R $ & $ {2 \over 3s} \left( {a 
\over R} \right)^2 			$ & $	{1 \over 3s} \left( {a \over R} \right)^2	$ & 
$ {1 \over s} \left( {a \over R} \right)^2		$ \\
\vphantom{$1 \over 2$} $ R \ll 1 \ll a $ & $ (s+2) \xi (s) \left( {a 
\over R} \right)^2 R^s	$ & $	{1 \over 3s} \left( {a \over R}
\right)^2	$ & $ {1 \over 3 s} \left( {a \over R} \right)^2	$ \\
\vphantom{$1 \over 2$} $ R \ll a \ll 1 $ & $ {4 \over 3 s (2-s)} 
\left({a \over R} \right)^{2-s}	$ & $	{1 \over 3s} \left( {a \over R} 
\right)^2	$ & $ {1 \over 3 s} \left( {a \over R} \right)^2	$ \\
\vphantom{$1 \over 2$} $ 1 \ll a \ll R $ & $ {\pi \over 4 s} {a \over 
R^2} 					$ & $	{\pi \over 4 s} {a \over R^2}			$ & $ {\pi \over 2 s} {a 
\over R^2}				$ \\
\vphantom{$1 \over 2$} $ 1 \ll R \ll a $ & $ {1 \over 4 (s+1)} {a^2 
\over R^3} 				$ & $	{1 \over 4 (s+1)} {a^2 \over R^3} 		$ & $ {1 \over 2 
(s+1)} {a^2 \over R^3}			$ \\\noalign{\smallskip}
\hline
\end{tabular}
\end{table}