How to combine elements from cell?

I have two 4x4 cells

a = 

    [10]    [11]
    [12]    [13]
b = 

    [20]    [21]
    [22]    [23]

How to combine a and b like this?

    [10,20]    [11,21]
    [12,22]    [13,23]

Answer 1

[Stephen23]

a = {10,11;12,13}

a = 2×2 cell array
    {[10]}    {[11]}
    {[12]}    {[13]}

b = {20,21;22,23}

b = 2×2 cell array
    {[20]}    {[21]}
    {[22]}    {[23]}

c = cellfun(@horzcat,a,b, 'uni',0)

c = 2×2 cell array
    {[10 20]}    {[11 21]}
    {[12 22]}    {[13 23]}

[Nimas]

Thanks