Hameroff does have some papers:
https://scholar.google.com/scholar?oi=gsb40&q=stuart hameroff&lookup=0&hl=en
For example
https://royalsocietypublishing.org/doi/abs/10.1098/rsta.1998.0254
From glancing at it, most of it seems to be overviews of his ideas, him trying to explain his speculations to scientific audiences. Most of his accounts seem to lean towards quantum physics, the idea seemingly being that if he can show that quantum processes occur in microtubules, then microtubules
may be quantum computers and that
just might have something to do with consciousness.
Wouldn't
every atom and molecule host quantum processes? So why aren't nucleic acids, proteins and cell membranes, crystals and even the chair you are sitting in supposedly quantum computers? Why aren't they all minds? Why aren't they all conscious? Why all the fascination with microtubules?
I'm a little put off by all the emphasis on physics, especially quantum physics which seemingly veers into "woo" whenever a layman touches it. And Hameroff is a layman. (Penrose has less excuse.) In fact quantum physics seems to me to be a bit of a red-herring/straw-man (aunt Sally for you Brits). It deftly diverts attention away from the speculation's real weakness: what exactly connects all of this quantum speculation to consciousness? And how precisely is that connection supposed to work? That's supposed to be the revolutionary scientific advance in all this after all, so it needs to be addressed straight on.
That's a job for the cell biologists, the neuroscientists, computer and cognitive scientists, to say nothing of the philosophers of mind. Not so much the quantum physicists.
And what's more, there doesn't really seem to be any kind of research program here. (If we want to draw a science/pseudoscience distinction, that might be one place to draw it.) We don't see Orch-OR
explaining anything. At least not in any way beyond hand-waving (
may be quantum computers which
may have something to do with whatever is to be explained). Never any actual detailed elucidations of the mechanism of what's to be explained, nothing that's precise enough to be actually tested.
It's just speculations and that's all that it's ever been.