Creating 50% OFF on second product of equal or lesser value

[Rhydil]

Hi Shopify Support,

Seek assistance,  I wanted to create a Discount code "SD 50", where customer customer would need purchase two items, and the items with lesser or equal will receive 50% discount. I try to create such promotion discount on the 'discount' tab, however it lead to cut the discount to the total amount. Seek assistance in how can I create such discount.

Thank you