These are Namiki's original papers. The method described there is stable but has large numerical errorsThere are some papers. I think they are useful to you maybe.
Painful but doable (there are a few online papers on PML for ADII think that it is most difficult to implement PML in ADI-FDTD.
from me tooGood luck.
here i upload the adifdtd code written in c language,i have it from internet source,i think this will help you to convert it to matlab.