documentclass[11pt]{article}

%usepackage{tabularx}


begin{document}

begin{table}[h!]
begin{center}
    begin{tabular}{| c | c|c | c | c|c|c| c| }
    hline
   &  1& 2 \ hlinehline
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 c  &  $R bar{f}$ & $L bar{f}$   \ hline
  a  &  $L f$ & $R f$   \ hline
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 hline
    end{tabular}
    end{center}
caption{}
end{table}
end{document}