(*
Odbojnost i refleksivnost na paru δ potencialov
Xo=((2  m*Wo*a)/(ℏ^2));x = ka
*)

T = 
        1/(1 + (xo^2/(2  x^2) + 
                    xo^4/(4  x^4))*(Sin[2  x])^2);

R = (1 + xo^2/(4  x^2))/(x/(xo*Sin[2  x])^2 + 1/2 + 
              xo^2/(4  x^2));
Plot3D[T, {x, 0.0001, 5}, {xo, 0, 3}, 
      ViewPoint -> {-1.705,  2.010,  2.868}, 
      AxesLabel -> {"x", "x0"}]

Plot3D[R, {x, 0.0001, 5}, {xo, 0.0001, 5}, 
      ViewPoint -> {-1.705,  2.010,  2.868}, 
      AxesLabel -> {"x", "x0"}]