Hi Andrey, Thank you for you response. where will I find "referrer" in Launch? I see traffic source as an option. Even then, in my scenario, if I want to fire the rule on page abc.com/thank-you where previous page is abc.com/summary I don't think referrer will work.
Create a Data Element with the Core extension to retrieve a referrer value (Core > Page Info > Referrer). Add a Value Comparison condition to the Rule to check if the referrer value (that data element) matches the one you are interested in.