Adding a second layer to a 2D matrix

I have having issues with trying to figure out how to add a second layer to a 2d matrix. I created a 4x4 matrix of random integers from -10 to 10. Now I have to add a second layer to the matrix so that it is 4x4x2. The new layer needs to be all zeros and it has to be done within one line of code. I have tried several things but nothing seems to work. Thanks in advance!

Answer 1

[Image Analyst]

Try cat(3,...)

newMatrix = cat(3, old2DMatrix, second2DLayer); % Will be 4x4x2

Use your own variable names, needless to say.