Any Scottish hammered coin experts out there?

Hi, I found this cut half penny the other week metal detecting.
Is this an Alexander II in the name of William coin? It looks very similar to the coin in "Coins of Scotland and Ireland And the Islands" number 5034.
Thanks in advance, Richard

Anyone out there?

Ok I will stick my neck out -------
I think its a Scottish coin William the Lion 1165-1214,

I think you are probably correct Don, I was hoping it might be the much rarer Alexander II. I've only managed to find half a dozen or so on auction sites having been sold for very high prices. I know a cut half will not attract anywhere near as high a price but a collector who needs an Alex II might pay a fair bit to get one.
Cheers ,Richard

It may pay to check this site and ask them just in case .
http://www.colchestertreasurehunting.co.uk/scottishIrishhammered.html