CloseKernels[];
LaunchKernels[8];
xres2 = 8;
yres2 = 8;
l = 1;
indTab = Flatten[Table[{ll, i, j}, {ll, Length[res1C[[l]]]}, {i, xres2 - 1}, {j, yres2 - 1}], 2];
DistributeDefinitions["Global`*"];

ParallelDo[

  ll = indTab[[ij, 1]];
  i = indTab[[ij, 2]];
  j = indTab[[ij, 3]];

  x0 = res1C[[l, ll, 1]];
  y0 = res1C[[l, ll, 2]];

  P1 = smplGrd[[x0 + 0, y0 + 0]];
  P2 = smplGrd[[x0 + 1, y0 + 1]];

  xint2 = Re[P1];
  xfin2 = Re[P2];
  xinc2 = (xfin2 - xint2)/(xres2 - 1);
  x2 = Table[xint2 + (i - 1) xinc2, {i, xres2}];

  yint2 = Im[P1];
  yfin2 = Im[P2];
  yinc2 = (yfin2 - yint2)/(yres2 - 1);
  y2 = Table[yint2 + (i - 1) yinc2, {i, yres2}];

  smplGrd2 = Table[x2[[ii]] + I y2[[jj]], {ii, xres2}, {jj, yres2}];

  OMint = Re[smplGrd2[[i + 0, j + 0]] nrm];
  OMfin = Re[smplGrd2[[i + 1, j + 0]] nrm];
  GMint = Im[smplGrd2[[i + 0, j + 0]] nrm];
  GMfin = Im[smplGrd2[[i + 0, j + 1]] nrm];

  Print[{OMint, OMfin, GMint, GMfin}]

  , {ij, (xres2 - 1) (yres2 - 1) Length[res1C[[l]]]}];

Set::wrsym: Symbol smplGrd2 is Protected.