Want to insert a matrix in a for loop and change it with a variable

Hello,

So, I have a variable phi(1x41) changing with lambda(1x41) and there is matrix (2x2) inside a for loop that needs to be changed with phi but the dimension of matrix should be (2x2x41) instead of (2x42) as it shown in workspace. Can anyone help me in this?

d1 = 0.1077;
lam = 3:0.1:7;
th = 0;
n1 = 2.32;

for j = 1:length(lam)
    phi1 =2*pi.*(d1./lam).*sqrt((n1).^2 - sind(th).^2);
    P1 = [exp(1i.*phi1) 0; 0 exp(-1i.*phi1)];
end

NOTE:-

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d1 = 0.1077;
lam = 3:0.1:7;
th = 0;
n1 = 2.32;

%Define phi1 outside the loop as it is not varying with the loop
phi1 = 2*pi.*(d1./lam).*sqrt((n1).^2 - sind(th).^2);
numlam = numel(lam);
%Preallocation
P1 = zeros(2,2,numlam);
for j = 1 : numlam

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Want to insert a matrix in a for loop and change it with a variable

Want to insert a matrix in a for loop and change it with a variable