I think it's called a wheat chain. If maybe someone can suggest a
book, I'd appreciate it.
It looks to me much more like a variation on the classic foxtail
structure. That is, “loop in loop”, made by making a whole bunch of
round rings, soldered closed before assembling into the chain, in
your choice of wire (in this case, flat strip), then mostly
flattening them to long thin ovals, folding the first in the middle,
and from there, inserting a link into the two loops formed, folding
that link, and repeating. With most, it’s straightforward, being
round wire. With this pattern, you’ll have to pay close attention to
how the flat wire nests into the prior and succedding links in order
to get a uniform pattern.
The middle photo in the second row in this page shows a bracelet
made with this structure in a very open, easy to see how it’s made,
The main difference with the flat strip wire is that both where the
link is compressed going though the prior link, at at it’s opened /
folded up ends, the wires need to be staggered, first one, then the
other, rather than side by side as is common with round wire. I
suspect that when you compact this chain after weaving (weave the
chain then gently mallet it, or draw through a wood drawplate, to
compress to a uniform tight structure) it will tend to do this
automatically, but you’ll want to check and make sure everything is
falling into the right places.