If I leave alpha with less than two years of service do I get the employer contributions refunded to me as well as my own?

No. If you leave with less than two years of service and choose to receive a refund, it will only be for the contributions you have paid (less any deductions for tax).  

If you leave with less than two years of service and choose to transfer your benefits to another scheme, the transfer will include the value of your employer contributions.