We used to use Flexcell fibre board, but like a lot of other things some clever person decided it was not flexible enough, although in my opinion it is plenty good enough.
The recommended product to use now is Hydrocell XL. It is difficult to get hold of and may have to be ordered.
You will also need Shear connectors with de-bonding sleeves. to tie joint together.
You must have a long length of wall to need expansion joints.
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