<html><body><div style="color:#000; background-color:#fff; font-family:arial, helvetica, sans-serif;font-size:12pt"><div>Dear users<br></div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: "Arial"; background-color: transparent; font-style: normal;">In boltztrap code the relaxation time is taken as constant for calculation of thermoelectric properties. Please any body tell me what will be the constant value? (1*10^-13 or 1*10^-14 sec) Its value for single layer garaphene is 3*10^-13 sec. Kindly anybody reply me soon.</div><div style="color: rgb(0, 0, 0); font-size: 16px; font-family: "Arial"; background-color: transparent; font-style: normal;">Thanks in advance</div></div></body></html>