a rectangular grid for two rectangles

Hello, I am trying to generate a rectangular mesh for a network of two and more rectangles that are in a stack. For each of them the mesh needs to be defined separately. Below is a piece of my code where I tried to define the geometry for two rectangles but I'm getting error message about wrong matrix dimensions. I would be very grateful if somebody can help me resolve this problem.

%% Geometry and Mesh

width = 0.3; height = 0.0001;

gdmTrans = [3 4 0 width width 0 0 0 height height]+ [3 4 0 width width 0 height height 2*height 2*height];

g = decsg(gdmTrans', 'S1', ('S1')');

[p,e,t]=poimesh(g,width/5e-3,height/0.005e-3);

figure;

pdemesh(p,e,t);

pdeplot(p,e,t);

title 'Plate With Triangular Element Mesh'

xlabel 'X [m]'

ylabel 'Y [m]'

Thank you very much in advance, Natalia