Dear Kwant Developer, I note there was a discussion in the community about next nearest neighbor hopping in the community (Leads with greater than NN hopping<https://www.mail-archive.com/search?l=kwant-discuss@kwant-project.org&q=subject:%22%5C%5BKwant%5C%5D+Leads+with+greater+than+NN+hopping%22&o=newest>). However, I still have the following questions about next nearest neighbour hopping in the lead after reading the discussion. 1. Can we add next nearest neighbour hopping to a lead without expanding the unit cell, if there are only hoppings between nearest neighbouring unit cells even with next nearest neighbour hopping? Can the band structure be calculated properly using the Kwant library? 2. When the lead is attached to the system, will the next nearest neighbour hopping be included in the action automatically? Thank you in advance for your help. KS Chan Disclaimer: This email (including any attachments) is for the use of the intended recipient only and may contain confidential information and/or copyright material. If you are not the intended recipient, please notify the sender immediately and delete this email and all copies from your system. Any unauthorized use, disclosure, reproduction, copying, distribution, or other form of unauthorized dissemination of the contents is expressly prohibited.