How to create the two-layer grid?

I find codding but in my mind it's not explained clearly that it is two layers.

%%Create the grid: a simple cartesian grid, 100m x 100m and 50 blocks on x
% and y directions.

% Two layer grid
x_size = 100;
y_size = 100;
z_size = 1;

Nx = 20;
Ny = 20;
Nz = 1;

G = cartGrid([Nx Ny Nz],[x_size y_size z_size]);
G = computeGeometry(G);
figure(1)
plotGrid(G);view(3);

Answer 1

[KSSV]

%%simple cartesian grid 
L = 100 ; B = 100 ;
nx = 50 ; ny = 50 ;

x = linspace(0,L,nx) ;
y = linspace(0,B,ny) ;

[X,Y] = meshgrid(x,y) ;
mesh(X,Y)
%%Two layer grid

Z1 = zeros(size(X)) ;
Z2 = ones(size(X)) ;

figure
hold on
surf(X,Y,Z1)
surf(X,Y,Z2)

[KSSV]

Vaya puta commented: actually, i want to make assume that grid is the reservoir, so I need cells and faces. like codding that I found (Finite Volume Methode) but that codding not represented 2 layer grid. any idea?

[KSSV]

Why don't you show a pictorial example of what you want?

[vaya putra]

here is the sample that i want.