The Halachic View of a 2 day Yom Tov
Rabbi Sruly Bornstein
Machlokes between the Noda B'Yehuda and the Shoel Umaishiv with regards to the second day yom tov. 3 reasons you cant prepare from day 1 to day 2: Chada Kedusha, Hachana, Kinyan Shvisa Sugya: יום טוב שני של גליות